NT1R20 Off-Premise Station Analog Line card Page 161 of 906Circuit Card Description and InstallationCard interfacesVoice and signaling interfacesThe eight line interfaces provided by the NT1R20 OPS analog line cardconnect to conventional, 2-wire (tip and ring), analog line facilities. Incominganalog voice and signaling information from a line facility is converted by theOPS analog line card to digital form and routed to the CPU over DS-30network loops. Conversely, digital voice and signaling information from theCPU is sent over DS-30 network loops to the OPS analog line card where itis converted to analog form and applied to the line facility.The OPS analog line card uses only eight of the 30 available timeslots for itseight line interfaces. The OPS analog line card can be configured in softwareto format PCM data in the μ-law or A-law conventions.Maintenance communicationMaintenance communication is the exchange of control and status databetween line or trunk cards and the CPU. Maintenance data is transportedthrough the card LAN link.The card LAN link supports the following functions on the NT1R20 OPSanalog line card:• polling• reporting of self-test status• CPU initiated card reset• reporting of card ID (card type and hardware vintage)• reporting of firmware version• reporting of line interface unit configuration• enabling/disabling of the DS-30X network loop busy• reporting of card statusPower interfacePower is provided to the NT1R20 OPS analog line card by the NTAK78ac/dc or NTAK72 DC power supply.
